Cook the black chickpeas till done in a pressure cooker. Drain and set aside.
Heat oil in a saucepan. Splutter the mustard seeds and fry the curry leaves.
Add in the black chickpeas and coat well. Add the onion, tomatoes and green chillies and toss well. Cook for a few minutes, but they should still stay crunchy.
Sprinkle in all the spice powders and toss well to coat. Cook for another couple of minutes.
Serve warm with a cup of tea or coffee.